The United Nations was formed after the failure of the League of Nations which had been tasked with maintaining international cooperation. The League of Nations lost its popularity and purpose in the early 1930s after the Axis Powers which comprised of Italy, Japan and Germany amassed considerable influence and started the World War 11 which began in 1939. The League of Nations which had been established in 1919 under the Treaty of Versailles had not achieved cooperation, peace, and security for nations after the end of the First World War. A body that would foster collaboration for countries through the achievement of international peace and cooperation was thus needed, and this led to the birth of the United Nations.
Franklin D. Roosevelt who was the current president of the United States was the brainchild behind the coining of the word United Nations. The name was first used in 1st January 1942 in the Declaration by the United States. Representatives from 26 nations had urged their governments to form the body as it would serve to fight the Axis powers that were causing war.
The United Nations formation came in 1945 just after the end of the Second World War. It is at the United Nations conference held in San Francisco at California that the Charter of the UN was formulated. The charter spelled down rules, regulations, and guidelines that would run the body such as the obligations and rights of member states, instruments of the United States, procedures and its organs.
The non-governmental and nations present at the conference signed the Charter and pledged to safeguard human rights, maintain friendly relations, maintain peace and security and better the living standards through ensuring social progress. United Nations started working on 24th October 1945 when its Charter achieved ratification a day that is remembered annually as the United Nations Day.